Here is a list of key ingredients that you can use for your smoothies. 

Greens

Kale
Collard Greens
Spinach
Dandelion Greens
Chard
Romaine
Green leaf lettuce

Herbs

Parsely
Mint
Basil
Cilantro

Citrus Fruits

Lemon
Lime
Oranges
Kiwi

Other Fruits

Blueberries
Cherries
Pineapple
Avocado
Banana
Apples
Goji Berries

Vegetables

Celery
Carrots
Cucumber
Pumpkin
Sweet potatoes 
Beets - Red or Golden

Other

Chia Seeds
Flax Seed
Raw Cacao Powder
Cinnamon
Ginger
Vanilla Extract
Stevia
Almond Butter